I read many posts regarding similar problems. It seems that Catalog price rules does not working as should. I have 2 stores: on Prestashop 1.5.3.1 (rules are working) and 1.7.7.2 (rules does not working).
Looks like this is bug on last versions of Prestashop. Very bad that authors of Prestashop do not fixing this bug, influenced on lot of functionality of Prestashop! Anв it seems not going to fix it.